Tourist attraction

Chicago Tribune historical photo

In 1970, watching the ground crews service a fleet of huge Boeing 747 jet liners was a tourist attraction at Chicago's O'Hare International Airport. During servicing, a worker climbs into the massive engine to keep the wind from moving the fan blades, thus pumping oil and causing waste.

In 1970, watching the ground crews service a fleet of huge Boeing 747 jet liners was a tourist attraction at Chicago's O'Hare International Airport. During servicing, a worker climbs into the massive engine to keep the wind from moving the fan blades, thus pumping oil and causing waste. (Chicago Tribune historical photo)

In 1970, watching the ground crews service a fleet of huge Boeing 747 jet liners was a tourist attraction at Chicago's O'Hare International Airport. During servicing, a worker climbs into the massive engine to keep the wind from moving the fan blades, thus pumping oil and causing waste.